%0 Journal Article
%T Z scan analysis for near top-hat beams<br>近top-hat光束Z扫描理论分析
%A Yang Xin-Jiang
%A Zang Wei-Ping
%A Tian Jian-Guo
%A Liu Zhi-Bo
%A Zhou Wen-Yuan
%A Zhang Chun-Ping
%A Zhang Guang-Yin
%A <br>杨新江
%A 臧维平
%A 田建国
%A 刘智波
%A 周文远
%A 张春平
%A 张光寅
%J 物理学报
%D 2005
%I 
%X The Z scan theory of thin optically nonlinear medium, by using the fast Hank el transform,is analyzed. The characteristics of Z scan curves under near to p-hat beams are discussed. Meanwhile, the influence of the ratio (diaphragm-gird ling ratio) of the limiting diaphragm radius to the radius of expanded beams on normalized transmittance using near top-hat beams under closed-aperture is analy zed. Through theoretical analysis, the ratio with the best sensitivity is given. Finally, the influence of the size of the far-field diaphragm on normalized tra nsmittance under the experimental configuration with the best sensitivity is ana lyzed.
%K high-accuracy fast Hankel transform
%K near top-hat beams
%K gaussian
%K beams
%K Z scan<br>高精度快速Hankel变换，
%K 近top-hat光束，
%K Gaussian光束，
%K Z扫描
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=F8337127C983DA1C&yid=2DD7160C83D0ACED&vid=318E4CC20AED4940&iid=B31275AF3241DB2D&sid=011F1533B0A7A0B2&eid=C23E2C6FDD0F2AFE&journal_id=1000-3290&journal_name=物理学报&referenced_num=2&reference_num=8